The Evolution of Movement

The word movement can be used in different senses, just as essence when considered a genus. All the movements by which one thing arrives at a natural state or produces an action suitable to its nature constitute so many species. But what common element is there in alteration, growth in generation and their contraries? What is there in common between these movements and the displacement in space when you consider the four movements as such? This question we will consider further on while studying alteration.